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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        class Singer {
            constructor(name) {
                this.name = name;
            }
            sing(song) {
                console.log(this.name + song);

            }
        }
    </script>
</body>

</html>